counteract (v.)

• annul
• antagonize
• baffle
• balance
• balk
• blast
• brave
• cancel
• challenge
• checkmate
• circumvent
• clash
• collide
• conflict
• confound
• confront
• confute
• contend
• contradict
• contrast
• contravene
• controvert
• correct
• counter
• counterattack
• counterbalance
• countercheck
• countermand
• counterpoise
• counterpose
• countervail
• cross
• dash
• defeat
• defy
• destroy
• discomfit
• disconcert
• discountenance
• dish
• disrupt
• elude
• face
• fix
• flummox
• foil
• front
• frustrate
• match
• mitigate
• negate
• negative
• neutralize
• nonplus
• nullify
• offset
• oppose
• oppugn
• perplex
• polarize
• protest
• rectify
• redress
• resist
• right
• ruin
• sabotage
• scotch
• spike
• spoil
• square
• stonewall
• stump
• subtend
• thwart
• traverse
• upset
• withstand